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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . T R A C E B A C K --
-- --
-- S p e c --
-- --
-- Copyright (C) 1999-2007, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- This package provides a method for generating a traceback of the
-- current execution location. The traceback shows the locations of
-- calls in the call chain, up to either the top or a designated
-- number of levels.
pragma Warnings (Off);
pragma Compiler_Unit;
pragma Warnings (On);
pragma Polling (Off);
-- We must turn polling off for this unit, because otherwise we get
-- elaboration circularities with System.Exception_Tables.
package System.Traceback is
----------------
-- Call_Chain --
----------------
procedure Call_Chain
(Traceback : System.Address;
Max_Len : Natural;
Len : out Natural;
Exclude_Min : System.Address := System.Null_Address;
Exclude_Max : System.Address := System.Null_Address;
Skip_Frames : Natural := 1);
-- Store up to Max_Len code locations in Traceback, corresponding to
-- the current call chain.
--
-- Traceback is the address of an array of addresses where the
-- result will be stored.
--
-- Max_Len is the length of the Traceback array. If the call chain
-- is longer than this, then additional entries are discarded, and
-- the traceback is missing some of the highest level entries.
--
-- Len is the returned actual number of addresses stored
-- in the Traceback array.
--
-- Exclude_Min/Exclude_Max, if non null, provide a range of addresses
-- to ignore from the computation of the traceback.
--
-- Skip_Frames says how many of the most recent calls should at least
-- be excluded from the result, regardless of the exclusion bounds and
-- starting with this procedure itself: 1 means exclude the frame for
-- this procedure, 2 means 1 + exclude the frame for this procedure's
-- caller, ...
--
-- On return, the Traceback array is filled in, and Len indicates
-- the number of stored entries. The first entry is the most recent
-- call, and the last entry is the highest level call.
function C_Call_Chain
(Traceback : System.Address;
Max_Len : Natural)
return Natural;
pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");
-- Version that can be used directly from C
end System.Traceback;
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